= Schoenfeld function for a three-person binary risk set
{c}
{title2=$s(\beta)=2/(2+e^\beta)\text{ for a one-covariate event}$}
If the <risk set> has two subjects with covariate zero and one with covariate one, its hazard-weighted mean is $e^\beta/(2+e^\beta)$. A zero-covariate event has <Schoenfeld function> $-e^\beta/(2+e^\beta)$, while a one-covariate event has function $2/(2+e^\beta)$. At the true coefficient their <probabilities> are $2/(2+e^\beta)$ and $e^\beta/(2+e^\beta)$, so the conditional expected function is zero.
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